It was never localized for North America or Europe. The PSP library was shrinking by 2009, and Sega decided the translation cost wasn't worth it. For 14 years, the definitive portable version of Tenchu was a Japanese exclusive.
A for the original Japanese menus if your patch is incomplete. Ninja Katsugeki - Tenchu San Portable English Patch
: It features additional missions and the ability to drag bodies, a mechanic originally found in the Xbox version ( Return from Darkness New Abilities It was never localized for North America or Europe